Conductive polyester composition

Abstract

A conductive polyester composition is provided, which includes a polyester base material and a conductive reinforcing material. The conductive reinforcing material includes a plurality of carbon nanotubes, and the plurality of carbon nanotubes are dispersed in the polyester base material. In each of the carbon nanotubes, a length of the carbon nanotube is defined as L, a diameter of the carbon nanotube is defined as D and is between 1 nanometer and 30 nanometers, and an L/D value of the carbon nanotube is between 300 and 2,000. The plurality of carbon nanotubes are in contact with each other to form a plurality of contact points, so that the conductive polyester composition has a surface impedance of not greater than 107 Ω/sq.

What is claimed is: 
     
       1. A conductive polyester composition, comprising:
 a polyester base material; and 
 a conductive reinforcing material, wherein the conductive reinforcing material includes a plurality of carbon nanotubes, and the plurality of carbon nanotubes are dispersed in the polyester base material; wherein in each of the carbon nanotubes, a length of the carbon nanotube is defined as L, a diameter of the carbon nanotube is defined as D and is between 1 nanometer and 30 nanometers, and an L/D value of the carb on nanotube is between 1,000 and 2,000; wherein the plurality of carbon nanotubes are in contact with each other to form a plurality of contact points, so that the conductive polyester composition has a surface impedance of not greater than 10 7  Ω/sq; 
 a compatibilizer configured to assist in dispersing the plurality of carbon nanotubes in the polyester base material, wherein, based on a total weight of the conductive polyester composition, a content of the compatibilizer is between 1.5 wt% and 10 wt%, 
 wherein the plurality of carbon nanotubes of the conductive reinforcing material are at least one material selected from a group consisting of hydroxylated carbon nanotubes and carboxylic carbon nanotubes; wherein the compatibilizer is a polyolefin compatibilizer formed by grafting, modification or copolymerization of glycidyl methacrylate (GMA), or a siloxane compound. 
 
     
     
       2. The conductive polyester composition according to  claim 1 , wherein in each of the carbon nanotubes, the length is between 10 micrometers and 20 micrometers, and the diameter is between 5 nanometers and 20 nanometers. 
     
     
       3. The conductive polyester composition according to  claim 1 , wherein, based on a total weight of the conductive polyester composition, a content of the polyester base material is between 70 wt % and 95 wt %, and a content of the conductive reinforcing material is between 1.5 wt % and 10 wt %. 
     
     
       4. The conductive polyester composition according to  claim 1 , wherein the plurality of carbon nanotubes of the conductive reinforcing material are multi-walled carbon nanotubes (MWCNT) having a multi-layer carbon atom structure. 
     
     
       5. The conductive polyester composition according to  claim 1 , wherein the glycidyl methacrylate in a molecular structure of the compatibilizer is capable of carrying out a ring cleavage reaction in a mixing process, and an epoxy group in the glycidyl methacrylate is capable of carrying out a chemical reaction with a reactive functional group on a surface of the carbon nanotube and/or an ester group in a molecular structure of the polyester base material after the ring cleavage reaction, so that the carbon nanotubes are dispersed in the polyester base material; wherein the reactive functional group on the surface of the carbon nanotube is at least one of a —OH functional group and a —COOH functional group. 
     
     
       6. The conductive polyester composition according to  claim 1 , wherein the plurality of carbon nanotubes of the conductive reinforcing material are at least one material selected from a group consisting of hydroxylated multi-walled carbon nanotubes and carboxylic multi-walled carbon nanotubes. 
     
     
       7. The conductive polyester composition according to  claim 1 , wherein the compatibilizer is at least one material selected from a group consisting of an ethylene-methyl acrylate-glycidyl methacrylate copolymer (E-MA-GMA), polyolefin elastomer-grafted glycidyl methacrylate (POE-g-GMA), polyethylene-grafted glycidyl methacrylate (PE-g-GMA), and a siloxane compound. 
     
     
       8. The conductive polyester composition according to  claim 1 , further comprising: an antioxidant, wherein, based on a total weight of the conductive polyester composition, a content of the antioxidant is between 0.1 wt % and 1 wt %. 
     
     
       9. The conductive polyester composition according to  claim 1 , wherein the conductive polyester composition is capable of mixing modification of a twin-screw process, and the conductive polyester composition has a surface impedance of not greater than 10 7  Ω/sq after the mixing modification of the twin-screw process. 
     
     
       10. The conductive polyester composition according to  claim 9 , wherein, after the conductive polyester composition is subjected to the mixing modification of the twin-screw process, a conductive polyester sheet material is formed; wherein the conductive polyester sheet material has a surface impedance of 10 3  Ω/sq to 10 4  Ω/sq before an extension, and has a surface impedance of 10 4  Ω/sq to 10 7  Ω/sq after a 200% to 400% extension along an extension direction.